The Delta BreezSlim SLM70 is a compact-sized, low noise, valued priced ENERGY STAR qualified fan. Perfect for single home retrofits as well as large multifamily projects. UL listed for both ceiling and sidewall installation. Fits inside a 4" wall. Air flow of 70 CFM with loudness rating of 2.0 sones. Features a DC brushless motor for extended reliability and low power consumption. 13.1 Watts with efficiency rating of 5.8 CFM per Watt. ENERGY STAR qualified and HVI certified.